Add support for a saving build objects in a separate directory.

Modifications are based on the linux kernel approach and
support two use cases:

  1) Add O= to the make command line
  'make O=/tmp/build all'

  2) Set environement variable BUILD_DIR to point to the desired location
  'export BUILD_DIR=/tmp/build'
  'make'

The second approach can also be used with a MAKEALL script
'export BUILD_DIR=/tmp/build'
'./MAKEALL'

Command line 'O=' setting overrides BUILD_DIR environent variable.

When none of the above methods is used the local build is performed and
the object files are placed in the source directory.

7 files changed, 60 insertions, 44 deletions

diff --git a/fs/Makefile b/fs/Makefile
index 79cbdeaa7a..273d90e011 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -1,5 +1,5 @@
 #
-# (C) Copyright 2000, 2001
+# (C) Copyright 2000-2006
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this
@@ -24,6 +24,6 @@
 
 SUBDIRS	:= jffs2 cramfs fdos fat reiserfs ext2
 
-.depend all:
+$(obj).depend all:
 	@for dir in $(SUBDIRS) ; do \
 		$(MAKE) -C $$dir $@ ; done
diff --git a/fs/cramfs/Makefile b/fs/cramfs/Makefile
index 54a475ef85..1a6f4b7d00 100644
--- a/fs/cramfs/Makefile
+++ b/fs/cramfs/Makefile
@@ -1,5 +1,5 @@
 #
-# (C) Copyright 2000, 2001
+# (C) Copyright 2000-2006
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this
@@ -23,25 +23,27 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= libcramfs.a
+LIB	= $(obj)libcramfs.a
 
 AOBJS	=
 COBJS	= cramfs.o uncompress.o
-OBJS	= $(AOBJS) $(COBJS)
+
+SRCS	:= $(AOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(AOBJS) $(COBJS))
 
 #CPPFLAGS +=
 
 all:	$(LIB) $(AOBJS)
 
-$(LIB):	.depend $(OBJS)
+$(LIB):	$(obj).depend $(OBJS)
 	$(AR) crv $@ $(OBJS)
 
 
 #########################################################################
 
-.depend:	Makefile $(AOBJS:.o=.S) $(COBJS:.o=.c)
-		$(CC) -M $(CFLAGS) $(AOBJS:.o=.S) $(COBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
-sinclude .depend
+sinclude $(obj).depend
 
 #########################################################################
diff --git a/fs/ext2/Makefile b/fs/ext2/Makefile
index 3b193684f5..2e420d536b 100644
--- a/fs/ext2/Makefile
+++ b/fs/ext2/Makefile
@@ -1,4 +1,7 @@
 #
+# (C) Copyright 2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
 # (C) Copyright 2003
 # Pavel Bartusek, Sysgo Real-Time Solutions AG, pba@sysgo.de
 #
@@ -24,25 +27,26 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= libext2fs.a
+LIB	= $(obj)libext2fs.a
 
 AOBJS	=
 COBJS	= ext2fs.o dev.o
-OBJS	= $(AOBJS) $(COBJS)
+
+SRCS	:= $(AOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(AOBJS) $(COBJS))
 
 #CPPFLAGS +=
 
 all:	$(LIB) $(AOBJS)
 
-$(LIB):	.depend $(OBJS)
+$(LIB):	$(obj).depend $(OBJS)
 	$(AR) crv $@ $(OBJS)
 
-
 #########################################################################
 
-.depend:	Makefile $(AOBJS:.o=.S) $(COBJS:.o=.c)
-		$(CC) -M $(CFLAGS) $(AOBJS:.o=.S) $(COBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
-sinclude .depend
+sinclude $(obj).depend
 
 #########################################################################
diff --git a/fs/fat/Makefile b/fs/fat/Makefile
index e4627577b7..2fa428c4dc 100644
--- a/fs/fat/Makefile
+++ b/fs/fat/Makefile
@@ -19,28 +19,27 @@
 # MA 02111-1307 USA
 #
 
-TOPDIR=../../
-
 include $(TOPDIR)/config.mk
 
-LIB	= libfat.a
+LIB	= $(obj)libfat.a
 
 AOBJS	=
 COBJS	= fat.o file.o
 
-OBJS	= $(AOBJS) $(COBJS)
+SRCS	:= $(AOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(AOBJS) $(COBJS))
 
 all:	$(LIB) $(AOBJS)
 
-$(LIB):	.depend $(OBJS)
+$(LIB):	$(obj).depend $(OBJS)
 	$(AR) crv $@ $(OBJS)
 
 
 #########################################################################
 
-.depend:	Makefile $(AOBJS:.o=.S) $(COBJS:.o=.c)
-		$(CC) -M $(CFLAGS) $(AOBJS:.o=.S) $(COBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
-sinclude .depend
+sinclude $(obj).depend
 
 #########################################################################
diff --git a/fs/fdos/Makefile b/fs/fdos/Makefile
index c25e744b92..e55ac8abbd 100644
--- a/fs/fdos/Makefile
+++ b/fs/fdos/Makefile
@@ -1,4 +1,7 @@
 #
+# (C) Copyright 2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
 # (C) Copyright 2002
 # Stäubli Faverges - <www.staubli.com>
 # Pierre AUBERT  p.aubert@staubli.com
@@ -25,25 +28,27 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= libfdos.a
+LIB	= $(obj)libfdos.a
 
 AOBJS	=
 COBJS	= fat.o vfat.o dev.o fdos.o fs.o subdir.o
-OBJS	= $(AOBJS) $(COBJS)
+
+SRCS	:= $(AOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(AOBJS) $(COBJS))
 
 #CPPFLAGS +=
 
 all:	$(LIB) $(AOBJS)
 
-$(LIB):	.depend $(OBJS)
+$(LIB):	$(obj).depend $(OBJS)
 	$(AR) crv $@ $(OBJS)
 
 
 #########################################################################
 
-.depend:	Makefile $(AOBJS:.o=.S) $(COBJS:.o=.c)
-		$(CC) -M $(CFLAGS) $(AOBJS:.o=.S) $(COBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
-sinclude .depend
+sinclude $(obj).depend
 
 #########################################################################
diff --git a/fs/jffs2/Makefile b/fs/jffs2/Makefile
index f28b17a414..82436bbfec 100644
--- a/fs/jffs2/Makefile
+++ b/fs/jffs2/Makefile
@@ -1,5 +1,5 @@
 #
-# (C) Copyright 2000, 2001
+# (C) Copyright 2000-2006
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this
@@ -23,26 +23,28 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= libjffs2.a
+LIB	= $(obj)libjffs2.a
 
 AOBJS	=
 COBJS	= jffs2_1pass.o compr_rtime.o compr_rubin.o compr_zlib.o mini_inflate.o
 COBJS	+= compr_lzo.o compr_lzari.o
-OBJS	= $(AOBJS) $(COBJS)
+
+SRCS	:= $(AOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(AOBJS) $(COBJS))
 
 #CPPFLAGS +=
 
 all:	$(LIB) $(AOBJS)
 
-$(LIB):	.depend $(OBJS)
+$(LIB):	$(obj).depend $(OBJS)
 	$(AR) crv $@ $(OBJS)
 
 
 #########################################################################
 
-.depend:	Makefile $(AOBJS:.o=.S) $(COBJS:.o=.c)
-		$(CC) -M $(CFLAGS) $(AOBJS:.o=.S) $(COBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
-sinclude .depend
+sinclude $(obj).depend
 
 #########################################################################
diff --git a/fs/reiserfs/Makefile b/fs/reiserfs/Makefile
index 98a9a8d30e..45028cb15e 100644
--- a/fs/reiserfs/Makefile
+++ b/fs/reiserfs/Makefile
@@ -1,4 +1,7 @@
 #
+# (C) Copyright 2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
 # (C) Copyright 2003
 # Pavel Bartusek, Sysgo Real-Time Solutions AG, pba@sysgo.de
 #
@@ -24,25 +27,26 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= libreiserfs.a
+LIB	= $(obj)libreiserfs.a
 
 AOBJS	=
 COBJS	= reiserfs.o dev.o mode_string.o
-OBJS	= $(AOBJS) $(COBJS)
+
+SRCS	:= $(AOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(AOBJS) $(COBJS))
 
 #CPPFLAGS +=
 
 all:	$(LIB) $(AOBJS)
 
-$(LIB):	.depend $(OBJS)
+$(LIB):	$(obj).depend $(OBJS)
 	$(AR) crv $@ $(OBJS)
 
-
 #########################################################################
 
-.depend:	Makefile $(AOBJS:.o=.S) $(COBJS:.o=.c)
-		$(CC) -M $(CFLAGS) $(AOBJS:.o=.S) $(COBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
-sinclude .depend
+sinclude $(obj).depend
 
 #########################################################################